Morphological characters of the cultivated rice grains of Fiji, 5
1993
Katayama, T.C. (Kagoshima Univ. (Japan). Faculty of Agriculture)
Succeeding to the previous papers, some morphological studies on grain characters and considerations on ecotypic differentiations of 20 strains of cultivated rice species, Oryza sativa L., collected in Fiji, South Pacific, were reported. The results obtained here were summarized as follows: 1. In the data obtained summer-up from 3 relation-groups, i.e., practical value on the other practical values, s.d. on the other s.ds. and variation range on other variation ranges, 17/27 character-combinations (=63.0%), 21/27 character-combinations (=77.8%) and 9/27 character combinations (=33.3%) showed significances, respectively. Average significant levels and their s.ds. through the whole character-combinations were found to be 1.78+-1.42, 1.48+-1.10 and 0.44+-0.74, respectively, in the same order. Through the 3 columns, 47/81 cases (=58.0%) showed significances. 2. Concerning correlations among the 3 components in the same characters, i.e., between practical value and its s.d., between practical value and its variation range, and between s.d. and its variation range, 13/24 characters (=54.2%), 8/24 characters (=33.3%) and 19/24 characters (=79.2%) showed significant relations, respectively. Average significant levels and their s.ds. through the whole characters were found to be 0.92+-1.00, 0.58+-0.91 and 1.67+-1.18, respectively, in the same order. Through the 3 columns, 40/72 cases (=55.6%) showed significances. 3. Varietal land ecotypic differentiations were extensively discussed, basing on the data from the previous and the present experiments. Characters and character-combinations confirmed in the experiments were to be looked upon as of something useful, having some universal validities and indices in the examinations of variety- and strain-differentiations
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